Hey Guys&Girls!

I' ve an unusual modeling problem. Its not a complex model, easy to rebuild. I just want to find a solution to fix it.
Its like a double extrude with merged vertxes. If I delete a face, i ve another face under it.
I can not select the extra faces & delete them.

I ve tried to separate them with soft select (doesnt work), maya UV mapping, headousUV,Zbrush(autoUV) & of course cleanup.
Cleanup makes like 1200 faces.
Anyone knows a normal way ?